Ductile iron pipe is magnesium or rare earth magnesium combined with golden agent in molten iron pouring before joining, nodulizing graphite, stress concentration is reduced, so that the pipe with high strength, high elongation, impact resistance, corrosion resistance, the advantages of good sealing; wall using cement mortar lining, improving water conveyance pipeline

Environment, improve the water supply capacity, reduce energy consumption; pipe adopts the flexible interface, and the pipe itself has larger elongation, the piping flexibility, can the soil around the pipeline and work together in the buried pipeline, improve the stress state of the pipeline, thus improving the reliability of pipe network operation. Therefore, at present our country water industry usually uses the ductile iron pipe as the competent material

The design requirements

The buried depth of pipeline shall be determined according to the degree of freezing, external load and other factors such as pipeline crossing. In general, buried depth may be frozen at the line 0.2 meters below, and meet the following conditions: when the diameter is larger than 100mm, the top of the pipe of minimum depth is 1.20 meters.

Design of trench bottom width is generally pipe outside diameter of 0.5 meters, and according to the soil condition, determination of excavation slope (I) of nodular cast iron pipe and other pipe like, uniform flow of water head loss along hf= lambda /dv2/2g, the difference is only "lambda" (the hydraulic frictional resistance coefficient), i.e., the head loss can be calculated according to the the original cast iron pipe the local resistance loss.

Nodular cast iron pipe and other pipe like, uniform flow of water head loss along as well as hf= lambda /dv2/2g, the difference is only "lambda" (the hydraulic frictional resistance coefficient), i.e., the head loss can be calculated according to the original cast iron pipe the local resistance loss. The emergence of ductile iron pipe provides a new pipe with excellent performance for our water supply industry. In order to apply the ductile cast iron pipe is better in engineering, design and construction personnel should be familiar with the characteristics of nodular cast iron pipe, constantly discover and solve the problem, to make the design more reasonable, the construction is more standardized, so that the new pipe to play a greater role in water supply project.

Main points: manual hydraulic drilling machine and drilling machine, drilling machine is to rely on human features manually through the drill holes in the pipeline: the need for manpower and time, simple operation and economic benefits; characteristics of the hydraulic drilling machine is through the electric pump or gasoline pump driven drill holes: human, mechanical opening. The need for daily maintenance, high cost. General aperture 300mm can be done by hand drilling machine

Q:How many kinds of elbow of ductile iron pipe?

You can measure the big money to camber, can call to the manufacturers to build. Seems to have 12.5 and 22.5 degrees, in the first two months we used 22.5 degrees elbow, the drawback is not good pull

Q:How to inspect ductile iron pipe fittings?

While the proportion of the so-called K8 class cement pipe and some manufacturers terrifying 3/4 or 3/5, as the water supply pipe 3/5 or no personally think that two of the proportion of the tube is not the problem, the most intuitive way of judging the quality of ductile pipe is cement and iron thickness ratio of thicker tube wall thickness of cement the better the quality, some manufacturers of production pipe, thick wall pipe head cast iron part looks to be thick, but there is also a thin iron pipe, so the judge quality to cut inside, personally think that the highest price of the manufacturer is Jinan steel, Jinan Iron and steel because the pipe quality can reach the national standard K9, the price is also below new, Saint Gobain and other major brands, as the water supply pipe K8 is no problem, but the price and quality for the construction of what importance Stronger.

Q:Is the ductile iron pipe metal pipe?

Ductile iron pipes are metal tubes, because ductile iron is also a kind of metal. See the classification of metalsGenerally, metal materials are classified into two major categories: ferrous and non-ferrous metals

Q:Could you tell me how to weld ductile iron parts and steel tubes?

MG289 electrode can be selected, welding electrodes and ductile iron into eighty degrees around the pipe around OK, and the intensity is higher than the strength of the cast iron. Direct cold, no heat treatment after welding.

Q:How is the weight of nodular cast iron pipe calculated?

Ductile iron pipe is a kind of cast iron pipe. In quality, the spheroidization of cast iron pipes is controlled to be 1-3 (spheroidization rate 80%), so the mechanical properties of the cast iron pipes, ductile iron pipes and finished product libraries can be better improved, with the nature of iron and the properties of steel. Ductile cast iron pipe after annealing, the microstructure is ferrite and pearlite, good mechanical properties, excellent corrosion resistance, good ductility, good sealing effect, simple installation, mainly for municipal, industrial and mining enterprises, water supply, gas, oil etc..

Rubber seal ring is formed by one or several parts of the cover, fixed in a ring or a washer bearing and another ring or gasket contact or the formation of the labyrinth of narrow gap, to prevent leakage of lubricating oil and foreign matter.

Q:How much is the installation of a two degree elbow for ductile iron pipe fittings at 11.25 degrees?

The main components of ductile iron pipes are carbon, silicon, manganese, sulfur, phosphorus and magnesium. In the ferrite and pearlite matrix on the distribution of a certain number of spheroidal graphite, according to the nominal diameter and the elongation of different microstructure of ferrite and pearlite in different proportions of small caliber pearlite percentage is generally not more than 20%, large diameter of the general control in about 25%. Minimum tensile strength: 420/Mpa, minimum yield strength 300/Mpa, minimum elongation 7%.

Q:How can the ductile iron pipe be connected to the PE pipe?

Cast iron pipe and PE pipe is connected with a lot of what is the most secure connection, flange connection (PE flange head + anticorrosive steel flanges + rubber gasket).

Q:How to improve the quality of nodular cast iron pipe fittings

For cast iron pipe chute taphole bent or improper chute taphole distance socket distance, easy to form a skin defect in cast iron pipe socket parts, equipment manufacturing inspection of cast iron pipe fittings must be in production, replacing the cast iron pipe chute taphole elbow when necessary, and adjust the host making iron centrifuge when the pipe in the lower limit, shorten the chute taphole socket from the distance.